2-chloroethane-(thiono)-phosphonic acid esters

ABSTRACT

Novel 2-chloroethanephosphonic acid and 2chloroethanethionophosphonic acid derivatives of the formula WHEREIN X is oxygen or sulfur; and R is aryloxy, optionally substituted with hydroxy, alkyl, halogen, or nitro, or monoarylamino, or monoalkylamino of from 1 to 6 atoms; exhibit marked plant growth influencing properties, e.g., inhibition or stimulation or alteration of plant growth.

United States Patent [191 Hofer et a1.

[ Nov. 5, 1974 2-CHLOROETHANE-(Tl-HONO)- PHOSPHONIC ACID ESTERS [75] Inventors: Wolfgang Hofer,

Wuppertal-Vohwinkel; Reinhard Schliebs, Cologne; Robert Rudolf Schmidt, Leverkusen; Ludwig Eue, Cologne, all of Germany [73] Assignee: Bayer Aktiengesellschaft,

Leverkusen, Germany [22] Filed: Sept. 29, 1970 [21] App]. No.: 76,594

[30'] Foreign Application Priority Data Oct. 4, 1969 Germany 1950099 [52] US. Cl 260/960, 71/86, 7l/87, 260/543 P, 260/953, 260/954 [51] Int. Cl. C07f 9/34 [58] Field of Search 260/960, 953, 954, 961

[56] References Cited UNITED STATES PATENTS 2,863,903 12/1958 Toy et al 260/961 2,922,810 1/1960 Toy et a1 260/961 X 3,644,600 2/1972 Beriger 260/959 OTHER PUBLICATIONS Grapov et al., Chemical Abstracts, Vol. 70, (1969), 37882k.

Primary Examiner-Lorraine A. Weinberger Assistant Examiner-Richard L. Raymond Attorney, Agent, or Firm-Burgess, Dinklage and Sprung [5 7] ABSTRACT Noyel 2-chloroethanephosphonic acid and 2-ch1oro- 5 Claims, No Drawings C1-CH2 plant-growth-regulating properties. Surprisingly, the

2-chloroethane-(thiono)-phosphonic acid derivatives according to the invention show a noteworthily greater plant-growth-regulating activity than the 2-chloroethanephosphonic acid known from the prior art which is the chemically closest active compound of the same type of activity. The substances according to the invention therefore represent a valuable enrichment of the art.

The invention also provides a process for the production of a 2-chloroethane-(thiono)-phosphonic acid derivative of the formula (I) in which a 2-chloroethane- (thiono)-phosphonic acid dichloride of the general formula X Cl 11 l-CH CH -P (II) in which X has the meaning stated above, is reacted with a phenol or primary amine of the general formula (III) in which R ha'sthe meaning stated above (in the case of a phenol, this may be used in the form of its alkali metal, alkaline earth metal or ammonium salt), optionally in the presence of an acid-binding agent and optionally in the presence of a solvent.

If 2-chloroethanephosphonic acid dichloride and methylamine are used as starting materials, the reaction course can be represented by the following formula scheme NH-CH3 iv The starting materials are defined generally by the formulae (II) and (III).

As examples of the amines or phenols which can be used as starting materials to make the compounds according to the invention, there may be mentioned in particular: phenylamine, methylamine, ethylamine, npropylamine, iso-propylamine, and n-, sec.-, tert.- and iso-butylamine; 2-, 3- and 4-chlorophenol, 2-, 3- and 4-nitrophenol, 2-, 3- and 4-methylphenol and resorcinol, catechol and hydroquinone.

The 2-chloroethane-(thiono)-phosphonic acid dichlorides, the primary amines and the phenols which may be used as starting materials are generally known and can be prepared according to known methods.

The solvent (this term includes a mere diluent) which may be used in the process according to the invention may for example be water or an inert organic solvent.

Preferred examples include aliphatic and aromatic hydrocarbons (which may be chlorinated), such as benzene, toluene, xylene, benzine, methylene chloride, chloroform, carbon tetrachloride and chlorobenzene; ethers, such as diethyl ether, dibutyl ether and dioxan; ketones, such as acetone, 'methylethyl ketone, methylisopropyl ketone and methylisobutyl ketone; and nitriles, such. as acetonitrile.

As acid acceptors, all customary acid-binding agents are suitable. Particularly suitable have proved to be the alkali metal carbonates and alcoholates, such as sodium or potassium carbonate, or sodium or potassium methylate or ethylate; and aliphatic, aromatic or heterocyclic amines, for example triethylamine, dimethylamine, dimethylaniline, dimethylbenzylamine and pyridine. Preferably an excess (for example of about one mole equivalent) of the amine of the general formul (III) to be used is employed as acid-binder.

The reaction temperature can be varied within a fairly wide range. In general, the reaction is carried out at 10 to 50, preferably at 0 to 20C.

The reactions are, in general, carried out at normal pressure.

When carrying out the process according to the invention, 2 moles of primary amine or 1 mole of phenol and about 1 mole of acid-binder or 1 mole of alkali metal phenolate, alkaline earth metal phenolate or ammonium phenolate may generally be. used per mole of 2-chloroethane-(thiono)-phosphonic acid dichloride. As indicated above, the reaction may be carried out ,in water or another suitable solvent, in most cases at room temperature.

Working up may take place according to customary methods. The substances according to the invention are obtained in most cases in the form of colorless to slightly yellow-colored, viscous, water-insoluble oils, which cannot be distilled without decomposition but can, by so-called slight distillation (that is, longer heating to moderately elevated temperatures under reduced pressure), be freed from the last volatile components and in this way be purified. They may be characterised especially by their refractive index as well as their elementary analysis.

The chloroethane-(thiono)-phosphonic acid derivatives interfere with the physiological phenomena of plant growth and can therefore be used as plant growth regulators.

The different effects of these active compounds depend essentially on the point in time of the application, with reference to the development stage of the seed or the plant, as well as on the concentration applied.

Plant growth regulators are used for various purposes which are connected with the development stage of the plants. Thus, with plant growth regulators, the seed germination can, depending on the concentration applied, either be inhibited or promoted. This inhibition or promotion relates to the seedling development.

The bud dormancy of the plants, that is to say the endogenic annular cycle, can be influenced by the active compounds, so that the plants for example shoot or blossom at a point in time at which they normally show no readiness to shoot or blossom.

The shoot or root growth can be promoted or inhibited by the active compounds in manner dependent on concentration. Thus, it is possible to inhibit very strongly the growth of the fully formed plant, or'to bring the plant as a whole to a more robust habitus or to produce a dwarf growth.

Possible economic applications include the suppression of grass growth at roadsides and waysides, and the inhibition of the growth of lawns so that the frequency of grass-cutting (of lawn-mowing) can be reduced.

During the growth of the plant, the branching to the side can be multiplied by a chemical breaking of the apical dominance. This is particularly useful in the case of propagation of plants by cuttings. In concentrationdependent manner, however, it is also possible to inhibit the growth of side-shoots, for example in order to prevent the formation of side-shoots in tobacco plants after decapitation and thus to promote the leaf growth.

In the case of the influencing of blossom formation, there can be achieved, in manner dependent on concentration and the point in time of the application, either a retarding or an acceleration of blossom formation. In certain circumstances, a multiplication of blossom initiation can also be attained, these effects occurring when the appropriate treatments are carried out at the time of the normal blossom formation.

The influence of the active compound on the foliage of' the plants can be so regulated that a defoliation is achieved, for example in order to facilitate the harvest or to reduce transpiration at a time at which the plants are to be transplanted.-

Fruit initiation can be promoted to that more fruits or seedless fruits are formed (parthenocarpy). In certain conditions, the premature fall of fruit can also be prevented, or the fruit fall can be promoted up to a certain extent in the sense of a chemical thinning out. The promotion of the fruit fall can also be exploited by effecting the treatment at the time of the harvest, whereby, harvesting may be facilitated.

By spraying the unripe fruits with the compounds according to the invention, the ripening process can also be accelerated and a better coloring of the fruits can be achieved.

The active compounds according to the present invention can be converted into the usual formulations,

such as solutions, emulsions, suspensions, powders,

pastes and granulates. These may be produced in known manner, for example by mixing the active compounds with extenders, that is, liquid or solid diluents or carriers, optionally with the use of surface-active agent, that is, emulsifying agents and/or dispersing agents. In the case of the use of water as an extender, organic solvents can, for example, also be used as auxiliary solvents.

As liquid diluents or carriers, there are preferably used aromatic hydrocarbons, such as xylenes or benzene, chlorinated aromatic hydrocarbons, such as chlorobenzenes, paraffms, such as mineral oil fractions, alcohols, such as methanol or butanol, or strongly polar solvents, such as dimethyl formamide or dimethyl sulphoxide, as well as water.

As solid diluents or carriers, there are preferably used ground natural minerals, such as kaolins, clays, talc or chalk, or ground synthetic minerals, such as highly-dispersed silicic acid or silicates. I Preferred examples of emulsifying agents include nonionic and anionic emulsifiers, such as polyoxyethylene-fatty acid esters, polyoxyethylene-fatty alcohol ethers, for example alkylarylpolyglycol ethers, alkyl sulphonates and aryl sulphonates; and preferred examples of dispersing agents include lignin, sulphite waste liquors and methyl cellulose.

The formulations contain, in general, from 0. Ho 95, preferably 0.5 to 90, percent by weight of active compound.

The active compounds may be applied as such or in the form of their formulations or of the application forms prepared therefrom, such as ready-to-use solutions, emulsifiable concentrates, emulsions, suspensions, spray powders, pastes, soluble powders, dusting agentsand granulates. Application may take place in the usual manner, for example by watering, squirting,

spraying, scattering, dusting, etc.

The concentrations of active compound can be varied within a fairly wide range for actual application. In general, concentrations of 0.0005 to 2 percent by weight, preferably 0.01 to 0.5 percent, are used.

Further, there are applied, in general, 0.1 to kg, preferably 1 to 10 kg, of active compound per hectare.

For the application time, it is generally true to say that the application of the growth regulators is effected in a preferred space of time, the precise delimitation of which is governed by the climatic and vegetative circumstances.

The compounds according to the invention also have an activity against plant-damaging bacteria.

The invention therefore provides a composition for the control of plant growth containing as active ingredient a compound according to the invention in admixture with a solid diluent or carrier or in admixture with a liquid diluent or carrier containing a surface-active agent.

The invention also provides a method for influencing plant growth which comprises applying to the plant or seed thereof a compound according to the invention alone or in the form of a composition containing as active ingredient a compound according-to the invention in admixture with a solid or liquid diluent or carrier.

The invention is illustrated by the following Examples.

The following compounds, representative of the invention, were used as test compounds and/or to illusic acid 4 hydroxyphenyl ester chloride Active compound trate preparation procedures, in the Examples, below. Compound 55 I8 I 2-Chloroethanethionophosphom Compound ic acid 3-nitrophenyl ester 1 (control unknown) Z-Chloroethanephosphonic acid chlol'ldfi 2 2-Chloroethanephosphonic acid mono-N-isopropylamide chloride 5 3 Z-Chlorocthanethionophosphonic acid mono-N-isopropylamide chloride g 4 2-Chloroethanethionophosphonic EXAMPLE A acid 3-chlorophenyl ester chloride I v 5 Z-Chloroethanethionophosphonic Gl'OWth lllhlbltlOn/Lll'lseed Test acid monoN-methylamide chloride l e 2-Chloroe thanethionophos- Solvent: 40 parts by weight acetone gillifizniigeacid phenyl ester Emulsifier: 0.25 part by weight alkylaryl polyglycol 7 Z-Chloroethanephosphonic acid ether I 8 g gg f; g' ho To produce a suitable preparation of active comoroe anep 1C 3.61 mono N n-butylamidpe chloride pound, 1 part by weight of active compound was mixed 9 2-Qhloroethanethionophosphonic with the stated amount of solvent whlch contained the :f,}g ester stated amount of emulsifier, and the concentrate was 10 2{Ihloroethanethionophosphonic diluted with a disoclium hydrogen phosphate-potassium f i .zghlowphenyl ester dihydrogen phosphate buffer solution (pH 6) to the dec on I ll 2-Chloroethanethionophosphonic Sued Concentratlonv afiid 2. -dichlorophenyl ester Two batches of l1nseeds were each laid out on a c loride LChIomethanePhosPhonic acid filter paper in a Petri dish. 10 ml of the preparation of mono-N-methylamide chloride active compound was pipetted mto each d1sh. Germination of the seeds took place in the dark at 25C.

mide chloride y 25 After three days, the length of the shoot and the roots l4 l wt p q was determined and the growth inhibition compared 15 leglolride with the control plant was expressed as a percentage.

P 05 phonic acid 4'-chlorophenyl 100 percent denoted the standstill of growth, and 0 perchlmide h corr s ondin to that of the un- 16 2-Chloroethane-thionophosphonic cent denoted a growt e p g acid 2',4'-dichlorophenyl ester 3 treated plant. 7 I Chloride The active compounds, the concentrations of the acl7 2-Chloroethanethionophosphontive compounds ink ppm mg/kg) and results are set forth in Tables Al and A2.

TABLE A1 Growth inhibition /1. ins eed 79 inhibition with 250 ppm root shoot water 0 0 (control) 0 n on CI-CH -CH -P 83 3e (known Compound 1) 2 NH-C H -i C1-CH -CH -P 85 (Compound 2 TABLE A2 Active compound 7 inhibition of the s hoo t wi th Emulsifier: 0.25 parts by weight alkylaryl polyglycol ether To produce a suitable preparation of active compound, 1 part by weight of active compound was mixed with the stated amount of solvent which contained the stated'amount of emulsifier, and the concentrate was Growth inhibition and defolia don/bean? 50 ppm 250 ppm wa ter O (control) O OH I II v CI-CH -(IJH -P I 36 (known-Co npound 1) "S NH-C H 1 c1-cn -r. n -P 40 5a c1 w fls' 3 e 8 o u CI-CH -CH -P 5O (Compound 4) EXAMPLE B diluted with a disodium hydrogen phosphate-potassium Growth Inhibition and Defoliation/B an dihydrogen phosphate buffer solution (pH 6) to the de- S olvent: 40 parts by weight acetone 40 slfed ConcentratlOn- Beans (Phaseolus vulgaris) 1O vcm high were-sprayed with preparations which contained 5,000 ppm of active compound. After 6 days, the average length and the number of leaves of 3 beans per experiment were evaluated.

The results can be seen from Table B.

mam a Active compound Length in cm Number of leaves water 17.0 6

(control) Z-chl-oroethanephosphonic acid 11.0 I v 4 (known) s NH-QH II C1 CH -CH -P 11.0 e 3 Cl (Compound 5) (Compound 2) TA BLE B Continued Growth inhibition and defoliation/beans S O- H Q Cl (Compound 6) EXAMPLE C 25 stated amount of emulsifier, and the concentrate was diluted with a disodiuin hydrogen phosphate-potassium Growth ll dihydro'genpho's phate buffer solution (pl-l m the de Solvent: 40 parts by weight acetone sire'd concentration. Emulsifier: 0.25 parts by weight alkylaryl 'polyglycol Wheat plants of a size of 4 cm were sprayed with a ether preparation which contained 50O0ppm of active com-. To produce a suitable preparation of active.com- 30 pound. After 10 days, the'average length'ofthe wheat pound, 1 part by weight of active compound was mixed was evaluz'ated. I with the stated amount of solvent which contained the The res'ii lts can be seen from Table ABLE Gpowth inhibition wheat Q QQ d LQF'S'Fh in Cm;

water I I Q 200 (control) Z-chlorqethane-phosphonic acid I 5 nown Compound 1) I S NH-CH n 5 Cl-CH CH2- P 6.0

Cl (Compound 5) S o 1| Cl-CH CH P T (Compound 6) Active compound l 1 EXAMPLE D Growth Inhibition/Beans (Watering Test) Solvent: 40 parts by weight acetone Emulsifier: 0.25 parts by weight alkylaryl polyglycol 5 ether 7 To produce a suitable preparation of active compound, part by weight of active compound was mixed with the stated amount of solvent which contained the stated amount of emulsifier, and the concentrate was diluted with a disodium hydrogen phosphate-potassium dihydrogen phosphatebuffer solution pH 6) to the desired concentration Three bean plants (of a height of 10 cm) in a pot (9 cm diameter) were watered once with a preparation of 15 active compound corresponding to an applied amount of 10 kg/hectare. After 8 days, the length of the beans was determined.

The results can be seen from Table D.

TABLE n 12 EXAMPLE E Growth Inhibition/Millet and 1,000 ppm of active compound. After 6 days, the

growth increase was evaluated.

7 The results can be seen from' Table E.

Growth inhibition/beans (watering test) water (control) Z- ch iofo ethane-phosphonic acid (known-Compound l) a Nil-CH (Compound 5) NH-C H -i C1CH CH -P Y a Cl (Compound 2) Length in "651 7 MW TA BLE F Growth inhibition/millet Growth increase I Active compound Concentration in ppm in cm water (control) 0 2-chloroethane-phosphonic acid 2000 2.0 (known Compound 1) 1000 5.0

a Nil-CH Cl-CH -CH -P 2000 '1.0

(Compound 5) 4.0

13 14 EXAMPLE F diluted with a disodium hydrogen phosphate-potassium Acceleration of Fruit Ripeness/Tomato Plants d'hydmge" phosphate buffer solutlon (PH 6) to the sired concentration. Solvent: 40 parts by weight acetone Emulsifierz 025 parts by weight alkylaryl polyglycol 5 Green, unripe fruits of tomato plants were sprayed ether once with a preparation which contained 5,000 ppm of To produce a Suitable preparation of active active compound. An accelerated ripening of the fruits pound, 1 part by weight of active compound was mixed was thereby achleved' with the stated amount of solvent which contained the The active compounds and results can be seen from stated amount of emulsifier, and the concentrate was 10 Table F.

" TABLE F r Acceleration of fruit; ripeness/tomato plants Active compound Acceleration of ripeness in days water 0 (control) ll CL-CHZ-CHZ-P i 12 Ol'l (known -Compound 1) s Nil-c1 ll C1-CH2-=CH2-P 15 (Compound 5) s) Nil-C 11 -i c1-cu CH -P 17 C1 (Compound 2 C1 (Compound 3) ether To produce a suitable preparation of active compound, 1 part by weight of active compound was mixed with the stated amount of solvent which contained the EXAMPLE G Growth Inhibition/Beans Solvent: 40 parts by weight acetone Emulsifier: 0.25 parts by weight alkylaryl polyglycol 5 dihydrogen phosphate buffer solution (pH 6) to the desired concentration.

Beans (Phaseolus) 10 cm high were sprayed with preparations which contained 2,500 ppm of active compound. After 6 days, the average length was determined and the inhibition of growth increased in comparison with the untreated control was expressed in percent.

stated amount of emulsifier, and the concentrate was 10 The active compounds and results can be seen from diluted with a disodium-hydrogen phosphate-potassium Table G.

TABLE 'c';

Growth inhibition/beans Active compound 7 inhibition of the shoot with 2500 ppm water g I 0 (control) CI CH CH -P 52 v OH (known orupound l) 0 NH C4119 n (Compound 8) c1-cH -cE -P 55 (Compound 9) Cl-CH =-CH -P 63 Cl (Compound 10) Cl 3 0 T ll Cl-CH -CH -=P C1 68 (Compound 11) EXAMPLE 1 PREPARATION OFCOMPOUND 5 s ,mr-cn n/ 3 Cl-CH -CH -P.

LeA 12482 c1" Analysis:

Calculated for 5 16.65 N 7.3% C H CI NPS: Found: 16.47 7.35

EXAMPLE 2 PREPARATION OF COMPOUND 6 19 g (0.2 mole) phenol in 50 ml H and 8 g (0.2 mole) sodium hydroxide were added at 20 to 39.5 g (0.2 mole) 2-chloroethanethionophosphonic acid dichloride. Stirring was effected for 2 hours at room temperature; taking up in methylene chloride was then effected, followed by separation of the organic phase and washing with water. After drying over sodium sulphate, the solvent was drawn off, and slight distillation was subsequently effected (1 mm Pig/60C).

Yield: 39 g (77 percent) of 2-chloroethanethionophsophonic acid phenyl ester chloride as colorless liquid, n 1.5688.

Analysis:

Calculated for C I-l Cl OPS: S 12.55% CI 27.9% Found: 12.46 28.82

EXAMPLE 3 PREPARATION OF COMPOUND 2 59 g (1 mole) i-propylamine were added at 0 to 91 g (0.5 mole) 2-chloroethanephosphonic acid dichloride in 1,500 ml toluene. Stirring was effected for 1 hour at room temperature, and the salts were filtered off with suction; the solution was washed with a little water, and the solvent was distilled off.

Yield: 93 g (91 percent) of 2-chloroethanephosphonic acid mono-N-isopropylamide chloride; n,,

Analysis:

Calculated for C H cl NOP: N 6.85 CI 34.8% Found: 6.58 33.74

EXAMPLE 4 PREPARATION OF COMPOUND 12' Analogously with Example 3, there was prepared the compound of the formula 0 NH-CII Yield: 56 percent 2-chloroethane-phosphonic acid I mono-N-methylamide chloride, n 1.5019

EXAMPLE 5 PREPARATION OF COMPOUND 3 59 g 1 mole) i-propylamine was added, with cooling, to 99 g (0.5 mole) 2-chloroethanethionophosphonic acid dichloride in 1,500 ml toluene. Stirring was effected for one hour at room temperature, then the salts were filtered off with suction; washing with water was effected, followed by'drying over sodium sulphate, and the solvent was drawn off. After slight distillation, a pale oil remained behind. Yield: '95 g 87 1 percent of the theory 2-chloroethanethionophosphonic acid mono-N-isopropylamide chloride, n 1.5476.

Analysis:

Calculated for C H Cl NPS: 32.15% Cl 6.35% N 14.55% s Found: 31.74% Cl 5.85% N 14.94% S EXAMPLE 6 PREPARATION OF COMPOUND Analogously with Example 5, there was prepared the compound of the formula Yield: 91 percent 2-chloroethane-thiono-phosphonic acid mono-N-n-butylamide chloride, n 1.5363.

EXAMPLE 7 PREPARATION OF COMPOUND 14 C1-CH2-CH2-P/ 93 g 1 molelaniline were added at 0C, with cooling, to 99 g (0.5 mole) 2-chloroethanethionophosphonic acid dichloride in 1,000 ml acetonitrile. Stirring was effected for 2 hours at room temperature, then the solvent was drawn off; taking up in benzene was effected, followed by separation of the salts and washing with 1N hydrochloric acid. After drying with sodium sulphate, the solvent was drawn off and the residue was slightly distilled. Yield: 101 g (79 percent of the theory) of 2-chloroethanethionophosphonic acid anilide chloride, n 1.6145.

Analysis:

Calculated for C 'H CbNPS: 28.00% 01 5.50% N 12.60% 5 Found: 28.00% 01 5.32% N 12.62% s EXAMPLE 8 PREPARATION OF COMPOUND 8 NH-=C 11 -n C1-CI-1 CH -P Calculated for C H CI NOP: 32.60% Cl 6.42% N Found: 32.38% Cl 6.52%N

EXAMPLE 9 PREPARATION OF COMPOUND S o ll Cl-CH -c11 -P A solution of 65 g (0.5 mole) 4-chlorophenol and 20 g (0.5 mole) sodium hydroxide in 200 ml of water was added at 20C, with vigorous stirring, to 99 g (0.5 mole) 2-chloro-ethanethionophosphonic acid dichloride. Stirring was effected for 1 hour at room temperature; taking up in methylene chloride was then effected, the aqueous phase was separated off and the organic phase was washed with a normal aqueous sodium hydroxide solution and subsequently with water. After drying with sodium sulphate, the solvent was drawn off and the residue was slightly distilled. There remained behind a pale oil, n 1.5856, yield: 86 g (59 percent of the theory) 2-chloroethanethionophosphonic acid 4'-chlorophenyl ester chloride.

Analysis:

Calculated for C H CI OPS: 36.80% Cl 11.05% S Found: 35.83% Cl 10.64% S EXAMPLE 1O PREPARATION OF COMPOUND 16 S (.23... II

cl-cn -cu -P C1 Yield: 60 percent 2-chloroethane-thiono-phosphonic acid 2,4-dichlorophenyl ester chloride, n 1.5962. 1

EXAMPLE '11 PREPARATION OF COMPOUND o C1-C1'1 C11 -P Yield: 64 percent 2-chloroethane thiono-phosphonic acid 4-methylphenyl ester chloride, n 1.5686.

EXAMPLE 12 PREPARATION OF COMPOUND s o Cl v -CH -CH -P 40 Yield: 58 percent 2-chloroethane-thion0-phosphonic acid 4'-hydroxyphenyl ester chloride, n 1.6031.

EXAMPLE l3 PREPARATION OF COMPOUND 10 C -CH -CH -P Yield: 66 percent 2-chloroethane-thiono-phosphonic acid 2-chloropheny1 ester chloride, n 1.5862.

EXAMPLE l4 PREPARATION OF COMPOUND T Cl CI-CH -CH -P- Yield: 53 percent 2-chloroethane-thiono-phosphonic acid 2,6-dichlorophenyl ester chloride, n 1.5944.

Cl CH -CH -P Yield: 73 percent 2-chloroethane-thiono-phosphonic acid 3-chlorophenyl ester chloride, n 1.5851.

EXAMPLE 16 PREPARATION OF COMPOUND 18 Cl CH -CH -P Yield: 34 percent 2-chl0roethane-thiono-phosphonic acid 3'-'nitrophenyl ester chloride, n 1.5985.

It will be appreciated that the instant specification and examples are set forth by way of illustration and EXAMPLE l PREPARATION OF COMPOUND not limitation, and that various modifications and changes may be made without departing from the spirit and scope of the present invention.

What is claimed is: 1. 2-Chloroethanephosphonic acid and 2- chloroethane-thionophosphonic acid compound of the general formula 5. Compound as claimed in claim 1 designated as 2- chloroethanethionophosphonic acid 4-methylphenyl ester chloride. 

1. 2-CHLOROETHANEPHOSPHONIC ACID AND 2-CHLOROETHANETHIONOPHOSPHONIC ACID COMPOUND OF THE GENERAL FORMULA
 2. Compound as claimed in claim 1 wherein R is phenyloxy or substituted phenyloxy substituted with methyl, hydroxy, or nitro.
 3. Compound as claimed in claim 1 designated as 2-chloroethanethionophosphonic acid phenyl ester chloride.
 4. Compound as claimed in claim 1 designated as 2-chloroethanephosphonic acid phenyl ester chloride.
 5. Compound as claimed in claim 1 designated as 2-chloroethanethionophosphonic acid 4''-methylphenyl ester chloride. 